patch 8.2.1484: flaky failure in assert_fails()

Problem:    Flaky failure in assert_fails().
Solution:   Only used fourth argument if there is a third argument.

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1484,
 /**/
     1483,
 /**/